Only 1 changed resistor inside in 40 years, pretty good for twice weekly
use over most of that time. Heaters glow but HT and bias supply stays up
and no extra current draw coming out of standby.
The 2.2K 7W W/W dropper for the minor HTs gone o/c.
First set went fine, switched to standby for break and then nothing
there for the second set. Is that resistor most stressed in standby?
No obvious overheating of the R or the whale hide or whatever "circuit
board" material.
Assuming no other problem , it just failed from old age/corrossion but
replace with same rating or go up to 11W?
No rubber insulation found , any health and safety considerations other
than the usual modern considerations? 2 issues with the Bulgin
plug+socket mounted on the cab but thats just a UK thing. I'll do the
usual remove the red voltage selctor knob on the rear and secure inside
and blank off the shaft of the switch, as too easy to drunkenly turn
that knob to "repair" a fault situation in UK 240V land.